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C65ZInstrExpander.cpp
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C65ZInstrExpander.cpp
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//===-- C65ZInstrExpander.cpp - Zero-page instruction expander ------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Expand Z instructions.
//
//===----------------------------------------------------------------------===//
#include "C65.h"
#include "C65InstrInfo.h"
#include "C65Subtarget.h"
#include "MCTargetDesc/C65BaseInfo.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetInstrInfo.h"
using namespace llvm;
#define DEBUG_TYPE "c65-z-instr-expander"
namespace {
class ZInstrExpander : public MachineFunctionPass {
public:
static char ID;
ZInstrExpander() : MachineFunctionPass(ID) {}
StringRef getPassName() const override {
return "C65 Z instruction expander";
}
private:
bool runOnMachineFunction(MachineFunction &MF) override;
void getAnalysisUsage(AnalysisUsage &AU) const override {
MachineFunctionPass::getAnalysisUsage(AU);
}
};
char ZInstrExpander::ID = 0;
}
FunctionPass *llvm::createC65ZInstrExpanderPass() {
return new ZInstrExpander();
}
/// runOnMachineFunction - Loop over all of the basic blocks, expanding
/// Z instructions
bool ZInstrExpander::runOnMachineFunction(MachineFunction &MF) {
bool Changed = false;
const C65Subtarget &STI = MF.getSubtarget<C65Subtarget>();
const C65TargetLowering &TL = *STI.getTargetLowering();
// Iterate through each instruction in the function, looking for pseudos.
for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I) {
MachineBasicBlock *MBB = &(*I);
for (MachineBasicBlock::iterator MBBI = MBB->begin(), MBBE = MBB->end();
MBBI != MBBE; ) {
MachineInstr &MI = *(MBBI++);
// If MI is a Z instruction, expand it.
if (MI.getDesc().TSFlags & C65II::ZRInstr) {
Changed = true;
MachineBasicBlock *NewMBB =
TL.EmitZInstr(&MI, MBB);
// The expansion may involve new basic blocks.
if (NewMBB != MBB) {
MBB = NewMBB;
I = MachineFunction::iterator(NewMBB);
MBBI = NewMBB->begin();
MBBE = NewMBB->end();
}
}
}
}
return Changed;
}